Ments to george w



J M. COOMBS,

Carriage-Wheel.

Patented Apr. 9, 1867.

NoVv 63, 705.

nis nomas PETERS ca, wAsHmornN. u. c.

nitrs'iutss stmt .fitted 'JOSEPHM oooMBS, vor BOSTON, MASSACHUSETTS, A sSGNou THROUGH MESNE AssuanH MENTS To GEQRGE W. CHIPMAN AND Joint RADDIN, oir-LYNN, MassscnnsnTTs.v

' Leners Patent ivo. 63,705, startspot s, 136i.

IMPROVEMENT nt casernes-WHEELS; 'y

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TO ALL WHOM I 'l MAY CONGERN: V V y Bc it known that I, JOSEPH M. COOMBS, of Boston, in the count),7 of Suffolk, and State of Massachusetts, have invented Improved Carriage-Wheels; and I do hereby declaro that the fiill'iwing, t'akcn in connection rvvit'rli'` the drawings 'hichaccompany'and form part of this specification, isl w' description of my invention suiiicient to enable those skilled in the art to practise it. l Y 'I The invention relates to the manner ofrendcring carriage-wheels elastic, toY save the carriage body from the effects ofjars and concussions produced Aby movement vof the carriage overrough ground and pavement, and against obstacles. l Y i l United StatesLetters Patenty 48,207 were granted on the thirteenth day of June, A. H1865, on an improved car1iage-\vl1eel. Inlsuch'vheel there is interposed between the outer end of` cach spoke and the 'elloe n. cushion or packing of rhher or\otlxer elastic material, so that any pressure from the' fclloc to the' hub, in the f line of the spoke, and tending/to compress the felloe towards the hub, was received directly against'nud borne by the rubber cushion. Such construction, however, though imparting to a considcrsable extent the difsirnble: j elasticity to the wheel, is objectionable, in that while there is a provision for contraction of the wheel fronn'; the bearing surface of the tire or felice to the huh, there is no provision fora compensating expansion oi' the wheel from the hub to the surfaccs'at right angles 4to the radial line of pressure. v l` The objc-ct of my invention is to remedy this defect by so arranging cushions orlsprings in 4connection irith Y the spokes that'the concussivc pressure and the weight of the carriage body tending to drive thefcllo'e towards the hub are borne by cushions acted against by expansion ,of the sides of the wheel. i v l v "It is this construction that' constitutes my invention, andthe drawings represent'airhes'fembodyingtlj' same, A show-'ing an elevation with a `sectional View of one ofthe spokes, andB a. radial section. i

a denotes the felloe, which islshown as a continuous metal rim, though it be made in sections, and of wood or other material, and may be surfaced hy a tii'e'in'the usual manner. b b are the spokes, c the huh. .One end of cach spoke has a screw-thread, d, by which it is secured to the hub,and the otheiend has ahead, e. lhisendot` the spoke plays within a. metal box, f, whichbox has anges, by which it is screwed to the inner surface ot` the felloe, as seenntg. ,The end ofthe spoke does not'abut aga-inst thcfelloc, but has an open space, t', left between such cud and felice surface. Between' the inner side oi' the heudor thc flange formed by said head and. the flange formed by the inner purt of the box, is'- a rubber or other springfc, surrounding the spoke, (a washer, Z, being interposed between the hettd and rubber, as seen at A,) so that if any section of the wheel is expanded from the hub tothe felloc, the strain is received by the pressure of the head of the spoke against tho spring or cushion. Each Spoke is adjusted in position, or so as torstrain the head against thcspring, by the screw which contines it to the hub. y i I p The action of the wheel is as follows'As the pressure exerted in the lino of any spolze, from the. f elloe to the-hub, tends to compress the fclloe towards thc huh, such c'ompression'expands the felloe atithc sides of thc Wheel and draws the heads of -thc spokes at such sides against the springs or cushions, ,and thus preserves the carriage from -severe jolts, adding greatly to its capabilities of wear, and rendering it a very casynnd com- I fortable vehicle; Y

In the modification shown at C, the end of the spoke applied to the huh has a nut, p, and a rubher'or 'spring y cushion, m, applied to it, a square'isocket or recess, fn, being made in tliehub into which the end of the'spoire extends, so that when4 the wheel-'expandsfrom the hub to the felloe, the strain is borne at both ends of the spoke, the spoke having square parts,l o, to which av wrench or wrenches may bc applied to tighten the spoke. v By my'oonstruction I ohvinte the objections and increase the advantages existing in the construction shown in the patent to which reference has been made, and the arrangerneut of the springs more simple andrclable, l and the-,wheels much stronger than in such Vpatented colnrtruotion.A The improvements are alikenpplinbl@ tu light;carriages and heavy wagons land cars.

I claim an elastic wheel, constructed 'with a provision for contraction of the hearing surface of the foil'oo towards the hub, Whenalso so` constructed that the expansion of the sides of thc wheel produced hy suchV contraction is resisted hy springs, substantiully'us set forth. v l I JOSEPH M. 600MB?.

Witnesses J.' B. Cuosr, Fnzwcis Geom, 

